Plural Works' Kouki Ikenouchi and ENECHANGE's Kaito Kaki to Speak ── Offers to Hold Webinar for Engineers on August 4th, Focusing on "Next-Generation Authentication Library Better-Auth"
overflow Inc. (Headquarters: Minato-ku, Tokyo; CEO: Yuto Suzuki; hereinafter referred to as overflow), operator of the AI-era engineer recruitment platform "Offers," will hold an online webinar titled "[Practical] What is the Next-Generation Authentication Library Better-Auth Supporting OAuth, 2FA, and Passkeys?" on August 4, 2026, as part of its engineer-focused webinar series "#Offers_DeepDive." The event will feature Kouki Ikenouchi, representative of Plural Works LLC, and Kaito Kaki from ENECHANGE Ltd. Masanori Onishi, a product development and technical advisor, will moderate the discussion, delving into the features of the authentication library "Better-Auth," its practical implementation, and how to differentiate its use from existing authentication solutions. Participation is free.
▶ Register here (Free): https://offers-jp.connpass.com/event/399802/
This Event is Recommended For:
Engineers struggling with choosing between IDaaS and in-house implementation for their authentication infrastructure, who want to learn about Better-Auth as an option.
Those who want to confirm implementation examples and security concerns regarding Better-Auth.
Those considering support for modern authentication methods such as passkeys and 2FA.
Event Overview
Item
Details
Title
[Practical] What is the Next-Generation Authentication Library Better-Auth Supporting OAuth, 2FA, and Passkeys?
Date and Time
August 4, 2026 (Tuesday) 7:00 PM - 8:00 PM (Live Stream)
Format
Online
Participation Fee
Free
Target Audience
Engineers who are struggling with or interested in selecting an authentication infrastructure.
Speakers
Kouki Ikenouchi (Representative, Plural Works LLC / Product Engineer), Kaito Kaki (Front-end Engineer, ENECHANGE Ltd.)
Moderator
Masanori Onishi (Product Development & Technical Advisor)
Organizer
overflow Inc. (Offers / #Offers_DeepDive)
Registration
https://offers-jp.connpass.com/event/399802/
Event Details
Have you ever struggled with implementing authentication features in modern web development? From the perspective of security risks and operational costs, it has become standard practice to "not build your own authentication infrastructure," leading many developers to consider IDaaS. However, when attempting to integrate it into actual work, you may face the following dilemmas:
Duplicate data management: How to synchronize user information in IDaaS with data in the application DB.
Functional limitations: Whether modern authentication methods like passkeys, 2FA, or Azure AD (Entra ID) can be supported depends "entirely on the IDaaS provider's specifications (convenience)."
In light of these challenges, the TypeScript-based authentication library "Better-Auth" is gaining attention as an option that breaks through the design wall of "wanting to avoid building from scratch but not wanting to be bound by IDaaS limitations." Developed by the team that took over Auth.js (formerly NextAuth.js), it is a library that supports modern authentication methods such as OAuth, 2FA, and passkeys, while offering the flexibility to maintain your own data.
However, while it is highly innovative, the reality is that few people have a concrete idea of "how it performs in actual use" or "in which cases it is suitable compared to IDaaS."
Therefore, this event will feature Mr. Ikenouchi and Mr. Kaki, who are practically utilizing Better-Auth in their product development, to explain its features, implementation details, and how to differentiate its use from existing authentication solutions.
We welcome a wide range of engineers, from those struggling with authentication infrastructure selection to those who have become interested in Better-Auth.
What You Will Learn at This Event:
Features of Better-Auth and its differences from IDaaS and in-house implementations.
How to support modern authentication methods such as OAuth, 2FA, and passkeys.
Practical implementation in real-world scenarios and how to differentiate its use from existing authentication solutions.
Speaker Profiles
Kouki Ikenouchi (Representative, Plural Works LLC / Product Engineer)
A product engineer interested in creating human-centered products and organizations. Currently developing "Chronock," a schedule coordination and calendar synchronization app.
Kaito Kaki (Front-end Engineer, ENECHANGE Ltd.)
Transitioned to engineering from a non-technical background, now in his 5th year of practical experience. Primarily develops using TypeScript, React, and Next.js. Recently, he has also been working on mobile app development with Expo as a hobby.
Masanori Onishi (Product Development & Technical Advisor | Moderator)
Has experience in product development at multiple companies. Became independent in June 2024 and is engaged in product development and technical advisory work.
Offers AI Harness Released as Open Source
Control your career from the terminal.
On June 10, 2026, Offers released "Offers AI Harness," a skill set that allows engineers to directly use Offers' job search, salary trend checks, and profile optimization features from their everyday AI coding agents (Claude Code, Codex, etc.), on GitHub under the Apache 2.0 license. Simply ask your AI agent to "find jobs that suit me," and you will receive matching job offers, skill gaps, and estimated annual salaries based on your registered profile.
▶ GitHub Repository (Apache 2.0): https://github.com/overflow-tm/offers-ai-harness
▶ Service Details & Implementation Guide: https://service.offers.jp/worker/ai-harness/
▶ Press Release: https://prtimes.jp/main/html/rd/p/000000294.000053307.html
[Upcoming Event] How Matsuo Lab Controls AI: Mechanisms for Ensuring and Improving Agent Accuracy - What is Agent Harness? | Held on July 9 (Thu)
How Matsuo Lab Controls AI: Mechanisms for Ensuring and Improving Agent Accuracy - What is Agent Harness?
▶ Register Now (Free)
Event Overview
Item
Details
Date and Time
・July 9 (Thu) 7:00 PM - 8:00 PM Live Stream
Venue
Online
How to Watch
Free participation registration is required at https://offers-jp.connpass.com/event/396197/
Event Lecture Content
Recently, the social implementation of LLMs has progressed, and products and business workflows utilizing AI agents are increasing. However, are you treating AI agents as "build and run, then done"? Attention is now focused on how to build mechanisms to ensure and continuously improve the accuracy of agents once they are created, and the term "agent harness" has recently come into use.
On the other hand, many people may feel the need to organize fundamental aspects such as "What exactly is agent harness?" and "How does it differ from context engineering?"
Therefore, this event will feature Mr. Hase from Matsuo Research Inc., a leader in AI research, who will provide an easy-to-understand explanation from the origins of agent harness and the background of its growing attention, to its specific applications and future evolution.
By properly setting up agent harness, the accuracy of AI agents can be continuously improved, not just through one-time tuning. This event will unravel the concept and practice behind this.
In the first half's LT, Mr. Hase will organize prerequisite knowledge such as what agent harness is and why it has become important with the evolution of LLMs.
In the latter half's discussion, the LT content will be further deepened, exploring specific use cases and examples of application at Matsuo Research Inc. from a practical perspective.
We welcome a wide range of engineers, from those who have become interested in the term "agent harness" to those who are facing challenges in controlling and improving AI agents.
Recommended For:
Those who have heard the term "agent harness" but want to clarify what it specifically refers to.
Those who are facing challenges in ensuring the accuracy of AI agents and building autonomous improvement cycles.
▶ Register Now (Free)
[Upcoming Event] How are you handling parallel development with Claude Code? Shikanosuke shares his favorite parallel development environment | Held on July 15 (Wed)
[Claude Code] How are you handling parallel development? Shikanosuke shares his favorite parallel development environment
▶ Register Now (Free)
Event Overview
Item
Details
Date and Time
・July 15 (Wed) 12:00 PM - 1:00 PM Live Stream
Venue
Online
How to Watch
Free participation registration is required at https://offers-jp.connpass.com/event/395255/
Event Lecture Content
In recent years, the widespread adoption of AI coding agents has significantly improved individual work speed. However, when it comes to "parallel development," where multiple tasks are advanced simultaneously using AI, there is still no single correct answer, and the situation continues to be explored.
Methods such as setting specifications and then deploying agents for front-end and back-end development, parallel management of Git branches, and even automated review and correction of pull requests are diverse considerations. Is "focusing on single tasks the strongest approach after all?" The optimal solution for parallel development remains unclear.
Therefore, this event will feature Mr. Kano from Ubie, who has developed custom tools like "Multi-Folder Git Clone" and is actively disseminating information on setting up parallel development environments utilizing AI agents. We will delve into the development environment configurations for achieving parallel development with demos.
In the demo, Mr. Kano will show us the actual screen, and we will explore specific tools and workflows that accelerate parallel development, including editor and multiple branch management methods, and the timing of context switching.
We look forward to participation from a wide range of engineers, from those who are about to start parallel development using AI to those who want to conduct parallel development more efficiently than ever before.
Recommended For:
Those who are using AI coding but are looking for ways to efficiently manage parallel development of multiple tasks.
Those who want to know what development environments, tools, and workflows other engineers are using for parallel development.
▶ Register Now (Free)
About Offers
Offers undergoes brand refresh. AI-era recruitment starts with Offers.
"Offers" is an engineer recruitment platform for the AI era. AI analyzes technical skills, experience, and aspirations from multiple angles to visualize market value and the next career step. You can set the latest job titles and skills in your profile, and receive offers from companies that resonate with you. Since its official release in September 2019, over 35,000 people nationwide have registered, and we have supported the recruitment of over 1,000 companies to date.
"Offers" - The AI-era engineer recruitment platform
"Offers Jobs" - A job platform for comparing and considering job openings based on desired conditions.
"Offers Magazine" - A media outlet providing career/technical trend commentary for engineers and Product Managers.
"Offers HR Magazine" - A media outlet providing recruitment know-how and HR domain commentary for corporate representatives.
"#Offers_DeepDive" - Technical trend events for candidates and developers.
About overflow Inc.
Item
Details
Company Name
overflow Inc.
Location
5F, Shin-Toranomon Jitsugyokaikan, 1-1-21 Toranomon, Minato-ku, Tokyo 105-0001
Representative
CEO Yuto Suzuki
Established
June 9, 2017
Capital
208.8 million yen
URL
https://overflow.co.jp/
Related Press Releases
2026-06-15 Kouki Hase, AI Development Business Director at Matsuo Research Inc., to Speak ── Offers to Host Engineer Webinar on "Agent Harness" on July 9
2026-06-16 So Kano from Ubie to Speak ── Offers to Host Engineer Webinar on "Parallel Development Environment for Claude Code" on July 15
2026-06-10 Offers Releases "Offers AI Harness" as Open Source ── From AI Agents to Job Search, Salary Trend Checks, and Profile Optimization
Inquiries Regarding This Release
overflow Inc. Public Relations TEL: 03-6555-2239 E-mail: [email protected]
FACT BOX
- Source: PR TIMES
- Category: Event
- Organizations: Ubie